Guide member for rock drills



A. E. PETERS Sept. 29, 1936.

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Patented Sept. 29, 1936 UNITED STATES GUIDE MEMBER FOR ROCK DRILLs Arthur E. Peters, Phillipsburg, N. J., assignor to lngersoll Rand Company, Jersey City, N. J., a corporation of New Jersey Application October 30, 1935, Serial No. 47,363

4 Claims. (Cl. 25545) This invention relates to rock drills, and more particularly to a guide member for rock drilling mechanisms comprising a support member or shell for holding the rock drill and guiding it in the correct relationship with respect to the work.

One object of the invention is to minimize the cost of maintenance of rock drills of this type by providing the rock drill with detachable guide ribs which may be replaced when unfit for service and thereby eliminate the greater expense of replacing a casing part.

Another object is to assure a rigid connection between the guide member and the rock drill and to enable the guide member to be conveniently and expeditiously attached to the drill.

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawing accompanying this specification and in which similar reference numerals refer to similar parts,

Figure 1 is a longitudinal side elevation, partly broken away, of a rock drill and a guide member constructed in accordance with the practice of the invention,

Figure 2 is a plan view of the guide member and a portion of the rock drill casing.

Figure 3 is a View taken through Figure 1 on the line 33 illustrating the manner in which one end of the guide member is connected to the rock drill casing, and

Figure 4 is an end elevation, partly broken away, illustrating a detail of the invention.

Referring more particularly to the drawing, 20 designates the guide member and 2| a rock drill to which the guide member is applied.

The rock drill 2|, of which only certain of the casing parts are shown, comprises a cylinder 22 and front and back heads 23 and 24, respectively, which may be secured to the cylinder by the usual side rods 25.

In accordance with the practice of the invention a casing part of the drill, in this instance the cylinder 22, is provided with a pair of lateral projections 26 having inclined surfaces 21 which cooperate with a peripheral surface 28 of the cylinder 22 to define grooves 29 in the rearward surfaces of the projections 26 for the accommodation of a flange 30 on the guide member 20.

The flange 30 is preferably located on the end of the guide member. It is of partly cylindrical shape and has an inclined surface 3| which seats upon and engages the inclined surface 21 to prevent relative lateral movement between the rock drill and the guide member 20 at that point. The inner surface 32 of the flange 30 and the adjacent portion of the guide member 20 s shaped to conform to the surface 28 against which it seats. Adjacent the ends of the flange 30 are lugs 33 having apertures 34 which, in the assembled position of the guide member, register with similar apertures 35 in the projections 26 to receive bolts 36 whereby the flange 30 may be drawn into firm engagement with the projec tions 26.

The elements of the guide member so far described are located at the front end of the guide member of which the body portion 31 is in the form of a plate having-ribs 38 on opposite sides to extend slidably into the guideways of a rock drill shell (not shown) but which may be of a well known type commonly employed for guiding and maintaining the rock drill in the. correct relationship with respect to the work. The 'plate is of such length that when the guide member is clamped against the projections 26, by the bolts 36, the rear'end of the plate extends to a point closely adjacent the lateral lug 39 at the rear extremity of the cylinder 22. space 40 will exist between the end of the plate and the adjacent surface of the lug 39 to avoid contact therebetween.

In the assembled position of the guide member a space 4| also exists between the plate 31 and the cylinder 22, and the only points of contact between the rock drill and the guide member are the inclined surfaces on these elements and the surfaces 32 and 28.

Oh the lower surface of the plate 31, adjacent the lug 39 and coaxial therewith, is an enlargement or boss 42 having an aperture 43 to register with a bore 44 in the lug 39. The bore 44 presents a plain cylindrical surface as does also the inner portion 45 of the aperture 43, and the outer portion 46 of the aperture 43 is threaded to accommodate the threads 41 on a feed nut 48 disposed in the bore 44 and the aperture 43.

The feed nut 48 serves the well known function of connecting the rock drill to a feed screw 49 whereby the rock drill is actuated longitudinally of its support. The front end 56 of the feed nut is of plain cylindrical shape to engage the surface of the portion 45 of the aperture. Similarly, the surface of that portion of the feed nut lying within the lug 39 is also of plain cylindrical form to snugly engage the surface of the bore 44.

The rearward end of the feed nut is in the form of a polygonally shaped head 5| for the accommodation of a wrench whereby the feed nut may be threaded into the aperture 43. Between the head 5| and the body portion of the feed nut is a collar 52 having teeth 53 on its periphery to engage similar teeth 54 on the back head 24 for preventing rotation of the feed nut.

In assembling the guide member on the rock drill, an end of the flange 30 is first entered in the outer end of a groove 29 so that the outermost portions of the projections 26 will overlap the flange 36. The guide member may then be ro- Thus, a slight tated about the rock drill casing to bring the aperture 43 into coincidence with the bore 44. The bolts 36 are then placed in position to draw the surfaces 21 and 3| into firm engagement with each other. Thereafter the feed screw 49, with the feed nut on it, may be placed in position. The feed nut is threaded into the aperture 43 to support the rear end of the guide member and-the back head 24 is then placed in position so that its teeth 54 engage the teeth 53 on the feed nut for holding the latter against rotary movement in the aperture.

In practice the present invention has been found to be highly eflicient and to effect a marked economy in the matter of maintenance of the drilling apparatus. It is a well known fact that the guide portions, in this instance the ribs 38, are

exposed to severe usage and consequent great wear. This is a factor which in, structures wherein the guide ribs are formed integrally with the drill cylinder is a cause of great expense since when they'become worn to a state of unserviceability it becomes necessary to also discard the cylinder. Constructed as in the present invention, whenever the guide ribs become worn only the comparatively inexpensive guide member 20 need be replaced.

I claim:

1. In a guide member for rock drills, the combination of a rock drill casing and a feed screw therefor, a saddle for the casing having guide portions, means on the casing overlapping aportion of the saddle to support one end of the saddle, and a feednut in the casing for the feed screw extending into the saddle for supporting the other end of the saddle.

2. In a guide member for rock drills, the combination of a casing and a feed screw therefor, an inclined surface on and extending transversely of the casing, a saddle for the casing having a surface to interlockingly engage the inclined surface, guide portions on the saddle, and a feed nut for the feed screw journalled in the casing and being threaded into the saddle to assist in supporting the saddle.

3. In a guide member for rock drills, the combination of a rock drill casing and a feed screw therefor, a saddle for the casing having guide portions, inclined portions on the casing and saddle interlockingly engaging each other, means for pressing the surfaces into firm engagement with each other, and a feed nut for the feed screw supported by the casing and being threaded into the saddle to connect the saddle and the casing together.

4. Ina guide member for rock drills, the com bination of a rock drill casing and a feed screw therefor, a saddle for the casing having guide portions, flanges on the casing and the saddle interlockingly engaging each other to prevent relative lateral movement between the saddle and the casing, means for clamping the flanges securely together, a'feed nut in the casing for the feed screw threaded into the saddle to connect the saddle to the casing, and teeth on the casing and the feed nut engaging each other to prevent rotary movement of the feed nut with respect to the saddle and the casing.

ARTHUR E. PETERS. 

